Initial commit

engines/grim/object.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef GRIM_OBJECT_H
+#define GRIM_OBJECT_H
+
+#include "common/list.h"
+
+namespace Grim {
+
+class SaveGame;
+
+class Pointer;
+class Object {
+public:
+	Object();
+	virtual ~Object();
+
+	void reset() { };
+	void reference();
+	void dereference();
+
+	int32 getId() const;
+
+private:
+	void setId(int32 id);
+	int _refCount;
+	Common::List<Pointer *> _pointers;
+	int32 _id;
+	static int32 s_id;
+
+	friend class Pointer;
+};
+
+class Pointer {
+protected:
+	virtual ~Pointer() {}
+
+	void addPointer(Object *obj) {
+		obj->_pointers.push_back(this);
+	}
+	void rmPointer(Object *obj) {
+		obj->_pointers.remove(this);
+	}
+
+	virtual void resetPointer() {}
+
+	friend class Object;
+};
+
+template<class T> class ObjectPtr : public Pointer {
+public:
+	ObjectPtr() :
+		_obj(nullptr) {
+
+	}
+	ObjectPtr(T *obj) :
+		_obj(obj) {
+		if (obj) {
+			Object *o = (Object *)_obj;
+			o->reference();
+			addPointer(o);
+		}
+	}
+	ObjectPtr(const ObjectPtr<T> &ptr) : Pointer() {
+		_obj = nullptr;
+		*this = ptr;
+	}
+	~ObjectPtr() {
+		if (_obj) {
+			Object *o = (Object *)_obj;
+			rmPointer(o);
+			o->dereference();
+		}
+	}
+
+	ObjectPtr &operator=(T *obj) {
+		if (obj != _obj) {
+			if (_obj) {
+				rmPointer(_obj);
+				_obj->dereference();
+				_obj = nullptr;
+
+			}
+
+			if (obj) {
+				_obj = obj;
+				_obj->reference();
+				addPointer(obj);
+			}
+		}
+
+		return *this;
+	}
+	ObjectPtr &operator=(const ObjectPtr<T> &ptr) {
+		if (_obj != ptr._obj) {
+			if (_obj) {
+				rmPointer(_obj);
+				_obj->dereference();
+				_obj = nullptr;
+
+			}
+
+			if (ptr._obj) {
+				_obj = ptr._obj;
+				_obj->reference();
+				addPointer(_obj);
+			}
+		}
+
+		return *this;
+	}
+	bool operator==(const ObjectPtr &ptr) const {
+		return (_obj == ptr._obj);
+	}
+	bool operator==(Object *obj) const {
+		return (_obj == obj);
+	}
+	operator bool() const {
+		return (_obj);
+	}
+	bool operator!() const {
+		return (!_obj);
+	}
+
+	T *object() const {
+		return _obj;
+	}
+	T *operator->() const {
+		return _obj;
+	}
+	T &operator*() const {
+		return *_obj;
+	}
+	operator T*() const {
+		return _obj;
+	}
+
+protected:
+	void resetPointer() override {
+		_obj = nullptr;
+	}
+
+private:
+	T *_obj;
+};
+
+}
+
+#endif